Murdered Leanne's hands were bound.
Leanne's decomposing body was discovered by a man walking his dog in Lindley Wood, North Yorkshire, on August 20.
The body had been wrapped in plastic bags then hidden in a quilt cover. Leanne, 16, from Bramley, Leeds, was reported missing last November after she failed to return home following a Christmas shopping trip.
Detective Superintendent Chris Gregg, of West Yorkshire Police, said plastic cable ties had been used to strangle the youngster and bind her hands. A dark coloured scarf was also found around her neck. 'When Leanne's body was found we discovered a number of bindings on her body. Her hands had been bound,' Mr Gregg said.
'She had a ligature and a scarf around her neck. We believe these items were used for strangulation.'
Mr Gregg said the cable ties were yellow, black and neutral in colour. Detectives also appealed for help in tracing Leanne's missing Ellesse coat and black boots. Mr Gregg said: 'If anyone has any information about where they are or has seen them discarded we want to hear from them.' Officers will continue searching dense woodland at Otley for clues.